Ultralow Distortion IF VGAData SheetAD8375FEATURESFUNCTIONAL BLOCK DIAGRAMVPOSCOMMBandwidth of 630 MHz (−3 dB) Gain range: −4 dB to +20 dBVCOMPWUPStep size: 1 dB ± 0.2 dBAD8375Differential input and outputOUT+Noise figure: 8 dB @ maximum gainVIN+OUT+Output IP3 of ~50 dBm at 200 MHzPOST-AMP α Output P1dB of 19 dBm at 200 MHzVIN–OUT–Provides constant SFDR vs. gainOUT–Parallel 5-bit control interface Power-down featureREGISTERSANDSingle 5 V supply operationGAIN DECODER24-lead, 4 mm × 4 mm LFCSP 1 -00 APPLICATIONS 24 A4A3A2A1A0 067 Differential ADC drivers Figure 1. High IF sampling receivers Wideband multichannel receivers InstrumentationGENERAL DESCRIPTION The AD8375 is a digitally controlled, variable gain, wide Fabricated on an Analog Devices, Inc., high speed SiGe process, bandwidth amplifier that provides precise gain control, high the AD8375 is supplied in a compact, thermally enhanced, IP3, and low noise figure. The excellent distortion performance 4 mm × 4 mm, 24-lead LFCSP package and operates over the and high signal bandwidth make the AD8375 an excellent gain temperature range of −40°C to +85°C. control device for a variety of receiver applications. –4065-p p Using an advanced high speed SiGe process and incorporating –5060E proprietary distortion cancellation techniques, the AD8375 @ 2VNT UO achieves 50 dBm output IP3 at 200 MHz. P/TT–6055UBm The AD8375 provides a broad 24 dB gain range with 1 dB , OOIP33dBc)–7050@ resolution. The gain is adjusted through a 5-pin control interface d (UTNP and can be driven using standard TTL levels. The open-collector TIO–8045UT outputs provide a flexible interface, allowing the overall signal R O), OTHD2 gain to be set by the loading impedance. Thus, the signal S–9040Bm dDI3 ( voltage gain is directly proportional to the load. IC NHD3IPO –10035O The AD8375 is powered on by applying the appropriate logic level to the PWUP pin. The quiescent current of the AD8375 is HARM –11030 52 406080100120140160180200 0 4- typically 130 mA. When powered down, the AD8375 consumes FREQUENCY (MHz) 72 06 less than 5 mA and offers excellent input-to-output isolation.